Lateral solid mixing in the fluidized bed with multi-tubes internals.

Abstract

The lateral mixing of fluidized particles in a fluidized bed with vertical or horizontal multi-tube internals was investigated by the unsteady state behaviour of tracer particles. The behaviour of the tracer particles is analyzed by a one-dimensional diffusion model. The tracer particles were activated alumina on which zinc acetate was adsorbed. The lateral diffusion coefficient of the particles was strongly affected by the hydraulic diameter of the internals, the gas velocity and the minimum fluidized gas velocity of the particles. Empirical equations for the lateral diffusion coefficient of the particles in a fluidized bed with vertical or horizontal multi-tube internals were obtained. The lateral diffusion coefficient of solid particles in an ordinary fluidized bed was correlated by an empirical equation. Thermal diffusivity obtained from lateral thermal conductivity in the fluidized bed with multi-tube internals agreed with the lateral diffusion coefficient at the same fluidized conditions.